/*
 * Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
 *
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 *
 *
 *
 *
 *
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 */

package com.sun.imageio.spi;

import java.io.File;
import java.io.InputStream;
import java.io.IOException;
import java.util.Locale;
import javax.imageio.spi.ImageInputStreamSpi;
import javax.imageio.stream.ImageInputStream;
import javax.imageio.stream.FileCacheImageInputStream;
import javax.imageio.stream.MemoryCacheImageInputStream;

public class InputStreamImageInputStreamSpi extends ImageInputStreamSpi {

  private static final String vendorName = "Oracle Corporation";

  private static final String version = "1.0";

  private static final Class inputClass = InputStream.class;

  public InputStreamImageInputStreamSpi() {
    super(vendorName, version, inputClass);
  }

  public String getDescription(Locale locale) {
    return "Service provider that instantiates a FileCacheImageInputStream or MemoryCacheImageInputStream from an InputStream";
  }

  public boolean canUseCacheFile() {
    return true;
  }

  public boolean needsCacheFile() {
    return false;
  }

  public ImageInputStream createInputStreamInstance(Object input,
      boolean useCache,
      File cacheDir)
      throws IOException {
    if (input instanceof InputStream) {
      InputStream is = (InputStream) input;

      if (useCache) {
        return new FileCacheImageInputStream(is, cacheDir);
      } else {
        return new MemoryCacheImageInputStream(is);
      }
    } else {
      throw new IllegalArgumentException();
    }
  }
}
